In 2036 the Observers have begun terraforming the earth. Walter has a plan to defeat them but his capture by the Observers may be problematic. Peter searches for Olivia who is encased in amber to reunite his family
Harvard is now a secret observer installation. But Walter remembers a secret entrance that will give him access to his lab and perhaps a way to recover his plan to rid the world of the Observers. Olivia gets a distasteful look at Observer interrogation methods as Etta questions a loyalist security guard in hopes of finding a way to restore power to the lab. As Olivia and Etta disagree on how to dispose of their captive they gain a greater appreciation of each others character.
After piecing together the videos of Walter's plan Olivia, Peter, Walter and Etta head to rural Pennsylvania to retrieve essential materials for the plan. There they encounter a group of archivists who may be able to help with some local obstacles.
An act of kindness by Peter draws attention to Etta. The Observers deal with an infiltrator and we learn of a resistance leader known as the Dove and coincidentally that that Phillip Broyles is working with the Observers.
Peter in the grip of mourning Henrietta's death, resorts to extreme measures in order to gain powers that will allow him to surpass those that the Observers possess - and hopefully and eventually find a means to defeat them.
The team retrieves another cassette tape from the amber. With Nina Sharp's help, the team recovers 2 cylinders. While Peter works independently to score a minor victory against the Observers, Olivia ascertains Peter's secret.